Chrysanthemum plant named ‘Yocool’

ABSTRACT

A new and distinct cultivar of  Chrysanthemum  plant named ‘Yocool’, characterized by its upright cut  Chrysanthemum  that is usually grown as a natural spray; dark green-colored foliage; freely flowering habit; uniform inflorescence form and development; large daisy-type inflorescences; white-colored ray florets; response time about ten weeks; strong peduncles; and good postproduction longevity.

Botanical designation: Chrysanthemum×morifolium.

Cultivar denomination: ‘Yocool’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Chrysanthemum plant, botanically known as Chrysanthemum×morifolium and hereinafter referred to by the name ‘Yocool’.

The new Chrysanthemum is a product of a planned breeding program conducted by the Inventor in Salinas, Calif. and Alva, Fla. The objective of the breeding program is to create new cut Chrysanthemum cultivars having inflorescences with desirable colors and good inflorescence form and substance.

The new Chrysanthemum originated from a cross-pollination made by the Inventor in November, 2000, in Salinas, Calif., of a proprietary Chrysanthemum×morifolium seedling selection identified as code number T2737, not patented, as the female, or seed, parent with a proprietary Chrysanthemum×morifolium seedling selection identified as T2870, not patented, as the male, or pollen, parent.

The cultivar Yocool was discovered and selected by the Inventor as a flowering plant within the progeny of the stated cross-pollination in a controlled environment in Alva, Fla., in March, 2002. The selection of this plant was based on its desirable inflorescence color and good inflorescence form and substance.

Asexual reproduction of the new Chrysanthemum by terminal cuttings in a controlled environment in Alva, Fla. since May, 2002, has shown that the unique features of this new Chrysanthemum are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the cultivar Yocool have not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, daylength and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Yocool’. These characteristics in combination distinguish ‘Yocool’ as a new and distinct cultivar:

-   -   1. Upright cut Chrysanthemum that is usually grown as a natural         spray.     -   2. Dark green-colored foliage.     -   3. Freely flowering habit, about eleven inflorescences per         flowering stem.     -   4. Uniform inflorescence form and development.     -   5. Large daisy-type inflorescences that are about 9 cm in         diameter.     -   6. Attractive white-colored ray florets.     -   7. Response time about ten weeks.     -   8. Strong peduncles.     -   9. Good postproduction longevity with inflorescences and foliage         maintaining good substance and color for about 17 days in an         interior environment.

Compared to plants of the female parent selection, plants of the new Chrysanthemum have slightly smaller inflorescences, have more inflorescences per flowering stem and flower about three to four days earlier.

Compared to plants of the male parent selection, plants of the new Chrysanthemum have more inflorescences per flowering stem and flower about one week earlier. In addition, plants of the new Chrysanthemum and the male parent selection differ in ray flower coloration as plants of the male parent selection have yellow-colored ray florets.

Plants of the new Chrysanthemum can be compared to plants of the Chrysanthemum×morifolium cultivar Vero, disclosed in U.S. Plant Pat. No. 6,399. In side-by-side comparisons conducted in Alva, Fla., plants of the new Chrysanthemum differed from plants of the cultivar Vero in the following characteristics:

-   -   1. Plants of the new Chrysanthemum had more inflorescences per         flowering stem than plants of the cultivar Vero.     -   2. Plants of the new Chrysanthemum flowered about ten days         earlier than plants of the cultivar Vero.     -   3. Plants of the new Chrysanthemum flowered more uniformly than         plants of the cultivar Vero.     -   4. Plants of the new Chrysanthemum had shorter peduncles than         plants of the cultivar Vero.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Chrysanthemum, showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Chrysanthemum.

The photograph on the first sheet comprises a side perspective view of a typical flowering stem of ‘Yocool’ grown as a natural spray.

The photograph on the second sheet comprises a close-up view of typical inflorescences of ‘Yocool’.

DETAILED BOTANICAL DESCRIPTION

In the following description, color references are made to The Royal Horticultural Society Colour Chart, 1995 Edition, except where general terms of ordinary dictionary significance are used. The aforementioned photographs and following observations and measurements describe plants grown in Salinas, Calif., under conditions which approximate commercial practice in a polyethylene-covered greenhouse. Two-week old rooted cuttings were planted on Nov. 3, 2004 and received four weeks of long day/short nights followed by short day/long nights until flowering. Plants were grown as single-stem natural spray cut Chrysanthemums. During the production time, the following environmental conditions were measured: day temperatures, 24 to 27° C.; night temperatures, 10 to 16° C.; and light levels, 2,000 to 4,000 foot-candles. Measurements and numerical values represent averages for six to ten typical flowering stems and were taken about ten weeks after the start of short days.

-   Botanical classification: Chrysanthemum×morifolium cultivar Yocool. -   Commercial classification: Daisy-type cut Chrysanthemum. -   Parentage:     -   -   Female or seed parent.—Proprietary Chrysanthemum×morifolium             seedling selection identified as code number T2737, not             patented.         -   Male or pollen parent.—Proprietary Chrysanthemum×morifolium             seedling selection identified as code number T2870, not             patented. -   Propagation:     -   -   Type.—Terminal tip cuttings.         -   Time to rooting.—About 10 to 14 days with soil temperatures             of 18 to 21° C.         -   Root description.—Fine, fibrous; white in color.         -   Rooting habit.—Freely branching. -   Plant description:     -   -   Appearance.—Herbaceous daisy-type cut flower that is             typically grown as a natural spray.         -   Flowering stem description.—Aspect: Erect. Length: About             109 cm. Spray diameter: About 17 cm. Stem diameter: About             8 mm. Internode length: About 3.3 cm. Texture: Pubescent;             longitudinally ridged. Color: 144A to 144B.         -   Foliage description.—Arrangement: Alternate. Length: About             6.2 cm. Width: About 4.1 cm. Apex: Acuminate. Base: Truncate             with attenuate tendencies. Margin: Palmately lobed; sinuses             mostly divergent. Texture: Upper and lower surfaces,             pubescent and leathery; veins prominent on lower surface.             Color: Developing and fully expanded foliage, upper surface:             Close to 147A. Developing and fully expanded foliage, lower             surface: Close to 147B. Venation, upper surface: Close to             147A. Venation, lower surface: Close to 147B. Petiole:             Length: About 2.2 cm. Diameter: About 4 mm. Texture, upper             and lower surfaces: Pubescent. Color, upper and lower             surfaces: 146A to 146B. -   Flowering description:     -   -   Appearance.—Daisy-type inflorescence form with elongated             oblong-shaped ray florets. Inflorescences borne on             terminals, arising from leaf axils. Disc and ray florets             develop acropetally on a capitulum.         -   Flowering response.—Under natural conditions, plant flower             in the autumn/winter in the Northern Hemisphere. At other             times of the year, inflorescence initiation and development             can be induced under short day/long night conditions (at             least 13.5 hours of darkness). Plants exposed to three to             four weeks of long day/short night conditions after planting             followed by photoinductive short day/long night conditions             flower about ten weeks later when grown as a natural spray.             Inflorescences uniform in form and development.         -   Postproduction longevity.—In an interior environment,             inflorescences and foliage will maintain good color and             substance for about 17 days in an interior environment.         -   Quantity of inflorescences.—Freely flowering habit, about             eleven inflorescences per stem develop.         -   Fragrance.—Faint; sweet.         -   Inflorescence size.—Diameter: Large, about 9 cm. Depth             (height): About 1.3 cm. Disc diameter: About 1.9 cm.             Receptacle diameter: About 9 mm. Receptacle height: About             7.5 mm.         -   Inflorescence buds.—Height: About 7.5 mm. Diameter: About             9 mm. Shape: Oblate. Color: Close to 146A.         -   Ray florets.—Shape: Elongated oblong. Length: About 4.5 cm.             Width: About 1.1 cm. Corolla tube length: About 5 mm. Apex:             Acute to emarginate. Base: Fused. Texture: Smooth, glabrous;             satiny; longitudinally ridged. Aspect: Initially upright;             when mature, mostly straight and perpendicular to the             peduncle. Number of ray florets per inflorescence: About 38             in two to three whorls. Color: When opening, upper and lower             surfaces: Close to 155D. Fully opened, upper and lower             surfaces: Close to 155D.         -   Disc florets.—Shape: Tubular, elongated. Length: About 7 mm.             Width, apex: About 3 mm. Width, base: About 2 mm. Number of             disc florets per inflorescence: About 150. Color: Immature:             Close to 154A. Mature: Apex: Close to 9A. Mid-section: Close             to 144C. Base: Close to 155D.         -   Phyllaries.—Quantity per inflorescence: About 32 in about             three whorls. Length: About 1.1 cm. Width: About 3.5 mm.             Shape: Lanceolate. Apex: Acute. Base: Truncate. Margin:             Entire. Texture, upper surface: Smooth, waxy. Texture, lower             surface: Pubescent. Color, upper surface: Close to 146A.             Color, lower surface: Close to 147A to 146A.         -   Peduncles.—Length: First peduncle: About 14.5 cm. Fourth             peduncle: About 17 cm. Seventh peduncle: About 22.5 cm.             Diameter: About 3 mm. Angle: About 30° from vertical.             Strength: Strong. Texture: Pubescent. Color: Close to 144A             to 146A.         -   Reproductive organs.—Androecium: Present on disc florets             only. Anther length: Less than 1 mm. Anther color: Close to             15A. Amount of pollen: None observed. Gynoecium: Present on             both ray and disc florets. Style length: About 7 mm. Style             color: Close to 154A. Stigma color: Close to 9A.         -   Seed/fruit.—Seed and fruit production has not been observed. -   Disease/pest resistance: Resistance to pathogens and pests common to     Chrysanthemums has not been observed on plants grown under     commercial conditions. -   Temperature tolerance: Plants of the new Chrysanthemum have     demonstrated good tolerance to low temperatures of 7° C. and high     temperatures high temperatures of 38° C. 

1. A new and distinct cultivar of Chrysanthemum plant named ‘Yocool’, as illustrated and described. 